http://europepmc.org/abstract/MED/16344317 http://europepmc.org/abstract/MED/14551737 http://europepmc.org/abstract/MED/11468183 http://europepmc.org/abstract/MED/7819113 http://europepmc.org/abstract/MED/8241511 http://europepmc.org/abstract/MED/24127483 http://europepmc.org/abstract/MED/14726385 http://europepmc.org/abstract/MED/17541398 http://europepmc.org/abstract/MED/11756185 http://europepmc.org/abstract/MED/26675346 http://europepmc.org/abstract/MED/24550227 http://europepmc.org/abstract/MED/21670202 http://europepmc.org/abstract/MED/25480502 http://europepmc.org/abstract/MED/23415222 http://europepmc.org/abstract/MED/23861036 http://europepmc.org/abstract/MED/26053404 http://europepmc.org/abstract/MED/21642962 http://europepmc.org/abstract/MED/23243274 http://europepmc.org/abstract/MED/25605254 http://europepmc.org/abstract/MED/12719725 http://europepmc.org/abstract/MED/16014569 http://europepmc.org/abstract/MED/17283363 http://europepmc.org/abstract/MED/22158541 http://europepmc.org/abstract/MED/22182918 http://europepmc.org/abstract/MED/27199251 http://europepmc.org/abstract/MED/16572201 http://europepmc.org/abstract/MED/10956404 http://europepmc.org/abstract/MED/11180073